Published practice bank

SQL: NULL, Joins and Aggregates

Three-valued logic, outer joins and aggregate behaviour, as defined by PostgreSQL 18.

Work through the available bank with feedback after each answer.

Practice under the real rules. See the answers at the end.

Questions: 25 · pass at 18

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Practice bank25 of 25

Exam questions25

25 of 25 in practice. Questions that depend on changing answers are kept out of scored practice.

Questions and source material appear in the official language of their source.

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